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TIL that 9-volt batteries are made of 6 roughly AAAA-sized cylindrical batteries

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4kdk6 TIL: It would take 19 minutes to fall from the pole to the earth's core
GYXNN TIL that Depression actually alters vision, making the world appear far more dull and monochrome. This is due to lower Retinal activity in comparison to someone that doesn't suffer from Depression.
OoAYe TIL that, in addition to books, France operates a legal deposit scheme for perfumes, where a copy of every new fragrance has to be sent to a library for preservation.
QAYe TIL that one of the reasons that so many Disney movies feature orphans is Walt Disney’s guilt over his mother’s death from a gas leak in the house he bought her.
vP4W4 TIL 8-10 year old boys were sometimes castrated to preserve the high prepubescent vocal range. (This practice stopped in the late 1700s)